Norton is a mailfish. He appears in many episodes, sometimes as a citizen. He is usually seen walking to deliver mail, but in "Idiot Box," he drives a mail truck. His name is revealed in the episode "Squid Plus One."
He is a light tan fish with light purple lips and a dark purple dorsal fin. He wears a light blue colored mailman uniform and carries a brown messenger bag with a dark blue hat.
Norton goes to 122 Conch Street to deliver the invitation to Galleria Diphteria and tells Squidward what the plus one means. Later, when Squidward is looking for a friend, he finds Norton, who says he is more of an introvert than a kidder. Squidward finds out Norton also likes toast point and fancy art galleries, but after Norton reveals that he hates clarinets, Squidward leaves, and Norton is very hard on himself.
(to SpongeBob) "All right, do we have to go through this every time I deliver your mail? Sheesh!"
"Oh, if I weren't already on parole."
"Actually I'm not a kidder, I'm much more of an introvert."
"When's Norton's time? When's Norton's time to shine?!"
"Stupid, stupid, stupid!"
His design resembles that of Nat Peterson, but colored orange and purple, and with the mailman uniform.